Module composition 

Multi-track video composition and audio mixing.

This module provides MultiTrackComposer for compositing multiple video layers onto a solid-colour canvas, and MultiTrackAudioMixer for mixing multiple audio tracks into a single output stream.

Both types produce source-only FilterGraph instances — call FilterGraph::pull_video or FilterGraph::pull_audio in a loop to extract output frames.

Structs

AudioConcatenator

Concatenates multiple audio inputs into a single seamless output stream.

AudioTrack

A single audio track in a MultiTrackAudioMixer mix.

CrossfadeJoiner

Joins two video inputs with a cross-dissolve transition.

LavfiSource

Generates video frames from an FFmpeg lavfi filtergraph string (e.g. color=s=1920x1080:c=black@0.0,drawtext=text='Title'), so a host such as the preview runner can feed a timeline-level generated overlay into a RealtimeComposer as pushed frames.

MultiTrackAudioMixer

Mixes multiple audio tracks into a single output stream.

MultiTrackComposer

Composes multiple video layers onto a solid-colour canvas.

ProxySource

A low-resolution proxy substitute for a VideoLayer’s source.

RealtimeComposer

Composites externally-decoded frames from several layers into one frame, reusing a single built filter graph across frames.

RealtimeLayer

One layer in a RealtimeComposer, composited bottom-up in Vec order (index 0 is the base; later layers blend on top).

RealtimeLayerDescriptor

The dimension-independent part of a RealtimeLayer: every field except width / height / pixel_format, which are only known once a frame has been decoded.

SolidSource

Generates a solid-color rgba frame stream.

TextSource

Renders a TextSpec into a source-only rgba frame stream.

VideoConcatenator

Concatenates multiple video inputs into a single seamless output stream.

VideoLayer

A single video layer in a MultiTrackComposer composition.

Enums

LayerSource

The source of a composited VideoLayer’s frames.